I think less then 1% of the routing nodes are profitable.

If you ad hardware, electricity and time spend you will get a number between zero and 5 nodes in total.

And now add the risk of locking many bitcoin or losing them in a hack, software or hardware exploit or some other scenario.

lightning

"Be your own bank" they say, gain a 3% APY. That's a -1% APY 4yo LN node story

06bc1a977d

I think less then 1% of the routing nodes are profitable.
If you ad hardware, electricity and time spend you will get a number between zero and 5 nodes in total. 
And now add the risk of locking many bitcoin or losing them in a hack, software or hardware exploit or some other scenario.